I am sympathetic to your incredulity but you are the one that needs to realize that yes these people exist and this one is here on HN discussing his mass murder plans with you.

That's not at all what my comment says or implies, and you know that.

No it isn't, because murder is always wrong. Killing in self-defense is not murder. Killing Nazis was a matter of self-defense. Murdering them would not be.

Well when you say something like "silencing someone by any means necessary based solely on their beliefs is justifiable" I think it's fair to make sure you know that you're literally advocating killing people based not on their actions, or even their words, but their thoughts.